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E2/E2 Lite
2.4
Recommended Circuit between the Connector and the MCU
This section shows recommended circuits for connection between the connector and the MCU when the
E2/E2 Lite is used. For details on the handling of signals, refer to section 2.5, Notes on Connection.
2.4.1
SWD Interface Connection between the 20-Pin and 10-Pin Connectors and the MCU
Figure 2.3 shows a recommended circuit for connection between the 20-pin and 10-pin connectors and the
MCU in SWD interface connection.
20-pin and 10-pin
1.27-mm pitch
connector
VCC
SWDIO/TxD
SWCLK/RxD
RES#
Not
connected
GND
Figure 2.3 Example of Connection between the 20-Pin and 10-Pin Connectors and the MCU in SWD
Notes:
1.
If a 10-pin (1.27-mm pin pitch) connector is mounted on the user system, pins 11 to 20 are
not used.
2.
The output of the reset circuit of the user system must be open collector.
3.
Since the E2 Lite does not support the SCI, it does not allow the programming of flash
memory with the use of programming software.
4.
The MD pin can operate even if it is not connected to the E2/E2 Lite. When the pin is not
connected to the E2/E2 Lite, a special circuit for the pin must be configured on the user
system. For details on the handling of the MD pin, refer to section 2.5, Notes on Connection.
R20UT4582EJ0100 Rev.1.00
Jul.16.19
VCC
1
2
4
10
Reset
circuit
Open-collector
6, 7, 8,
11, 12, 13, 14, 16, 18, 20*
3, 5, 9,
1
15, 17, 19*
Interface Connection
Pull up at
4.7 kΩ to 10 kΩ
VCC
VCC
2
buffer*
1
Designing the User System
MCU
VCC
SWDIO/RxD9
SWCLK/TxD9
RES#
Page 12 of 30
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